Special Provision: A

Nitrocellulose membrane filters, with not more than 12.6% nitrogen, by dry mass

Nitric acid other than red fuming, with more than 20 percent and less than 65 percent nitric acid

Nitrating acid mixtures with not more than 50 percent nitric acid

Nitrating acid mixtures, spent with more than 50 percent nitric acid

Nitrating acid mixtures spent with not more than 50 percent nitric acid

Nitrating acid mixtures with more than 50 percent nitric acid

Nicotine compounds, liquid, n.o.s. or Nicotine preparations, liquid, n.o.s

Nickel nitrate

Nickel nitrite

Naphthalene, crude or Naphthalene, refined